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Does a visually appealing and professional designed site has an impact on the CTR?
Does the seamless intergration of Adsense Ads into your design makes an impact? (color , place)
Is it important to blend the ads with the content?
In general? Yes. On a site-by-site basis? That depends. This is a tremendously broad topic with lots of caveats and exceptions. I'd suggest you read back through the threads on this forum to find some excellent discussions about all three of your questions.
Why does Adsense allow ads on amateur and scam pages?
Why shouldn't they allow ads on amateur pages? Much of the information on the web is posted by amateurs, and the quality of their site design has nothing to do with the quality of their content.
As for why Google allows ads on scam pages... well, that's an old and long-running debate. Search this forum for threads on scraper sites to see where it stands now.
So I lived with my sites from June 2004 to February 2005 only by more and more content.
Starting February at a EPC crisis, I started to do some improvements
The CTR improved
times 1.2 bad ads in the URL filter
times 1.5 blend in
times 1.5 placement optimization
Also, from the point of view of the advertisers, what matters is that who is clicking is actually interested in the product/service being offered. It really does not matter where do they come from or if the site where the ad is shown is "professional". If they feel that scrape sites creates that sort of clicks, no reason for them to complain. And so won't Google, which is better off creating mechanisms to rule out those sites from its search engine, since there what matter is actually content quality.
About the question if a professional design counts, I would say yes. I myself do not care to see a site that is not visually well organized, unless I really have to.
Note that "professional look" is not taking some pictures of people using tie and glasses from imagebanks and putting in the website. I hate to see pictures of people using ties. :)
Also, from the point of view of the advertisers, what matters is that who is clicking is actually interested in the product/service being offered. It really does not matter where do they come from or if the site where the ad is shown is "professional". If they feel that scrape sites creates that sort of clicks, no reason for them to complain.
Visit the AdWords forum, and you'll see quite a few posts by advertisers who have found that clicks from scraper sites are worthless. Their complaints are probably the reason why Google just introduced domain blocking for advertisers on its content network.
Visit the AdWords forum, and you'll see quite a few posts by advertisers who have found that clicks from scraper sites are worthless.
My experience as an advertiser is just the opposite. Clicks from scraper sites have astounding conversion rates as one would expect. After all, the ads on scraper sites are among the most targeted you'll find anywhere.
My guess is the poor conversions many webmasters experience are a result of poorly worded ads and/or poorly written sales pages.
That being said, I prefer not to have my ads running on scraper sites due to the ethics (or lack of) involved.
I found that eliminating all the unnecessary links and distractions for people to click on improves my click rate from 2-3% to 10 to 14%
Now the pages just have the biz listing and 2 links. I put the links right above the adsense ads so people's eyes have to travel over the adsense ads to find any link out of the page. There are 16,000 pages of listings. The site went from a waste of my time to being a huge revenue stream due to adsense. After I realized how the pages should be laid out and applied this to some other sites revenue doubled from each site.
Use a simple site layout with soft colors. Ad eye catching color to your adsense ads without going over board and being gaudy and remember the more there is to click on besides your adsense ad the lower your click through rate will be. I even have a few sites that used nothing but a nice gray and black design except for the adsense ad link colors. This draws the eye like a magnet and click rates are huge.
Put your adsense ads at top and side and any links at the bottom of your page. Use soft colors for your links that make the site and nav links less distracting to your visitors unless you really want those links to stand out and be noticed and clicked.
Follow this type of theme for your sites and your adsense click rate will be nice and high.